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How safe is the tube lifter? What happens if the power fails, for example?

The suction area of the load-carrying equipment and the diameter of the lifting tube are matched to each other in such a way that the lifting force of the suction foot (vacuum cup) or the vacuum gripper is always larger than the lifting tube. If you were to try to lift a load that exceeds the capacity of the suction foot, this load would never be lifted in the first place. A power failure also presents no danger; if the vacuum supply were to fail for such a reason, a non-return valve ensures safe, slow and controlled lowering before the load can fall off. A tube lifter (vacuum lifter) is thus a safe system that is far better in this regard than other lifting equipment.